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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '337a80131dc4c78ffbd9779645d838b5bda20a410c466350303ad5e12c66ccea' 
  AND token = '9lGrNW+weQWhI0oIT4YXTX7JsBme+Is1qOke7I0rGC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}